PCI: fold pci_calc_resource_flags() into decode_bar()

decode_bar() and pci_calc_resource_flags() both looked at the PCI BAR
type information, and it's simpler to just do it all in one place.

decode_bar() sets IORESOURCE_IO, IORESOURCE_MEM, and IORESOURCE_MEM_64
as appropriate, so res->flags contains all the information pci_bar_type
does, so we don't need to test the pci_bar_type return value.

decode_bar() used to return pci_bar_type, which we no longer need.  We
can simplify it a bit by returning the struct resource flags rather than
updating them internally.

In pci_update_resource(), there's no need to decode the BAR type bits
again; we can just test for IORESOURCE_MEM_64 directly.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 17 insertions, 28 deletions

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 3e7a00a3fc81..ef17cf99830e 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -67,21 +67,6 @@ static int __init pcibus_class_init(void)
 }
 postcore_initcall(pcibus_class_init);
 
-/*
- * Translate the low bits of the PCI base
- * to the resource type
- */
-static inline unsigned int pci_calc_resource_flags(unsigned int flags)
-{
-        if (flags & PCI_BASE_ADDRESS_SPACE_IO)
-                return IORESOURCE_IO;
-
-        if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
-                return IORESOURCE_MEM | IORESOURCE_PREFETCH;
-
-        return IORESOURCE_MEM;
-}
-
 static u64 pci_size(u64 base, u64 maxbase, u64 mask)
 {
         u64 size = mask & maxbase;      /* Find the significant bits */
@@ -100,17 +85,21 @@ static u64 pci_size(u64 base, u64 maxbase, u64 mask)
         return size;
 }
 
-static inline enum pci_bar_type decode_bar(struct pci_dev *dev,
-                                           struct resource *res, u32 bar)
+static inline unsigned long decode_bar(struct pci_dev *dev, u32 bar)
 {
         u32 mem_type;
+        unsigned long flags;
 
         if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
-                res->flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
-                return pci_bar_io;
+                flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
+                flags |= IORESOURCE_IO;
+                return flags;
         }
 
-        res->flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
+        flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
+        flags |= IORESOURCE_MEM;
+        if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
+                flags |= IORESOURCE_PREFETCH;
 
         mem_type = bar & PCI_BASE_ADDRESS_MEM_TYPE_MASK;
         switch (mem_type) {
@@ -120,14 +109,15 @@ static inline enum pci_bar_type decode_bar(struct pci_dev *dev,
                 dev_info(&dev->dev, "1M mem BAR treated as 32-bit BAR\n");
                 break;
         case PCI_BASE_ADDRESS_MEM_TYPE_64:
-                return pci_bar_mem64;
+                flags |= IORESOURCE_MEM_64;
+                break;
         default:
                 dev_warn(&dev->dev,
                          "mem unknown type %x treated as 32-bit BAR\n",
                          mem_type);
                 break;
         }
-        return pci_bar_mem32;
+        return flags;
 }
 
 /**
@@ -180,9 +170,9 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
                 l = 0;
 
         if (type == pci_bar_unknown) {
-                type = decode_bar(dev, res, l);
-                res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN;
-                if (type == pci_bar_io) {
+                res->flags = decode_bar(dev, l);
+                res->flags |= IORESOURCE_SIZEALIGN;
+                if (res->flags & IORESOURCE_IO) {
                         l &= PCI_BASE_ADDRESS_IO_MASK;
                         mask = PCI_BASE_ADDRESS_IO_MASK & (u32) IO_SPACE_LIMIT;
                 } else {
@@ -195,7 +185,7 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
                 mask = (u32)PCI_ROM_ADDRESS_MASK;
         }
 
-        if (type == pci_bar_mem64) {
+        if (res->flags & IORESOURCE_MEM_64) {
                 u64 l64 = l;
                 u64 sz64 = sz;
                 u64 mask64 = mask | (u64)~0 << 32;
@@ -219,7 +209,6 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
                         goto fail;
                 }
 
-                res->flags |= IORESOURCE_MEM_64;
                 if ((sizeof(resource_size_t) < 8) && l) {
                         /* Address above 32-bit boundary; disable the BAR */
                         pci_write_config_dword(dev, pos, 0);
@@ -245,7 +234,7 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
         }
 
  out:
-        return (type == pci_bar_mem64) ? 1 : 0;
+        return (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
  fail:
         res->flags = 0;
         goto out;